# What is work-energy theorem and prove it?

The work energy theorem states that work done on a body is equal to the net change in its energy. (P.E or K.E) Proof: Consider a body of mass ‘m’ moving with an initial velocity u. Let a constant force F acting on a body changes its velocity to v.

## What is work-energy simple definition?

Work is the transfer of mechanical energy from one object to another. Since work is a movement of energy, it is measured in the same units as energy: joules (J).

## What is the work-energy theorem physics in motion?

W net = K B − K A . According to this theorem, when an object slows down, its final kinetic energy is less than its initial kinetic energy, the change in its kinetic energy is negative, and so is the net work done on it. If an object speeds up, the net work done on it is positive.

## What is work-energy theorem state its equation?

The work-energy theorem states that the net work done by the external forces on an object is equal to the change in kinetic energy of the object. If \(∆K\) represents the change in kinetic energy of the body and \(W\) represents the work done on it by the external forces, then: \(∆K = W\).

## When can you use the work-energy theorem?

In situations where the motion of an object is known, but the values of one or more of the forces acting on it are not known, you may be able to use the work-energy theorem to get some information about the forces.

## What is work-energy theorem prove it in Brainly?

Work energy theorem states that the change in kinetic energy of an object is equal to the net work done on it by the net force. Hence, work done on a body by a force is equal to the change in its kinetic energy.

## What is the definition of work power and energy?

Work, Energy and Power are fundamental concepts of Physics. Work is said to be done when a force (push or pull) applied to an object causes a displacement of the object. We define the capacity to do the work as energy. Power is the work done per unit of time.

## How is work defined in physics?

work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.

## What is difference between work energy and force?

Work is referred to as the displacement of an object when a force (push or pull) is applied to it while energy is referred to as the capacity to do the work. It exists in various forms like potential, kinetic, chemical, thermal, nuclear, electrical energy and so on.

## What is work-energy theorem example?

For example, as an object falls in a gravitational field from a high elevation to a lower elevation, some of the object’s potential energy is changed into kinetic energy. However, the sum of the kinetic and potential energies remain constant.

## Who created work-energy theorem?

W = Δ K E = 1 2 m v 2 2 − 1 2 m v 1 2 . The subscripts 2 and 1 indicate the final and initial velocity, respectively. This theorem was proposed and successfully tested by James Joule, shown in Figure 9.2.

## Is the work-energy theorem always true?

It is instructive to note that the work-energy theorem given by equation (5) is always true, whether or not the force F derives from a potential.

## Why is work-energy theorem important?

The work-energy theorem states that the total work done by all of the forces on the object is equal to the change in kinetic energy of the object. This theorem is important because it allows us to predict the direction, speed, or energy of a moving object.

## What is work-energy theorem BYJU’s?

According to this theorem, the net work done on a body is equal to the change in kinetic energy of the body. This is known as Work-Energy Theorem.

## What is the advantage of work-energy theorem?

What advantages does the work-energy theorem have? The work-energy theorem has the advantage that if an item moves from point A to point B, the work done on it can be calculated by integrating the area that is applied as a force and multiplying it by the work done.

## What is the unit of work is?

The SI unit of work is joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one meter.

## What is Work energy theorem Class 11?

The work-energy theorem, also known as the principle of work and kinetic energy, states that the total work done by the sum of all the forces acting on a particle is equal to the change in the kinetic energy of that particle.

## What is unit of work and energy?

The standard unit used to measure energy and work done in physics is the joule, which has the symbol J.

## What is the SI unit of work energy and power?

SI unit of work = joule (J) SI unit of energy = joule (J) SI unit of power = watt (W) Dimensional formula of work =ML2T−2.

## What is work done formula?

Work done = force × displacement. W = F × s. The SI unit of work is Joule (J).

## What is the relation between work and energy?

Energy should be transferred to an object to move it. Transferring energy can be in the form of force. This amount of energy transferred by the force to move an object is called work or work done.

## What is definition of energy in physics?

energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another.

## What is the SI unit of energy?

The SI unit of energy is same as that of work, which is joule (J).